Question

If one puts one ears to the steel rail, the sound of a coming train can be heard even when the train cannot be seen. One can conclude from this observation that
A. Sound travels faster in steel than in air.
B. Amplitude of sound in the rail is much larger than in air.
C. Sound can travel larger distance in solids than in air.
D. Quality of sound in rail is better than in air.
The reasonable conclusion are

• A. A and C
• B. A and B
• C. B and C
• D. None of these

Answer 1

The correct option is B A and B

Velocity of sound is maximum in solids and least in gases
$V_{gas}<V_{liquid}<V_{solid}$
Intensity would also be much lower in air as $I\propto a^2$